Influence of Laser Treatment Modes of Cast Iron on the Parameters of Hardening Zones and Their Tribotechnical Properties

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Abstract

The paper considers the results of metallographic and tribotechnical tests of cast iron in friction pairs with 40Kh steel. It is shown that the use of transverse oscillations of the laser beam significantly increases the processing performance, eliminates surface defects that occur when radiation is applied to the surface of cast iron samples with a defocused beam. It is established that laser thermal hardening significantly reduces the coefficients of friction and increases microhardness by 4–6 times and wear resistance of modified cast iron surfaces in 2.5–3.5 times compared to their initial state, depending on the processing modes.

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About the authors

Vladimir P. Biryukov

Mechanical Engineering Research Institute of the Russian Academy of Sciences (IMASH RAN)

Author for correspondence.
Email: photonics@technosphera.ru
Scopus Author ID: 0000-0001-9278-6925

Cand.of. Eng.

Russian Federation, Moscow

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Supplementary files

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2. Fig. 1. Graphs of the dependence of the depth and width of the zones of laser hardening of cast iron GI20 with a beam dimeter of 3.6 mm: a and c – quenching with a defocused beam; b and d – quenching with transverse oscillations of the beam with a frequency of 216 Hz

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3. Fig. 2. Cross-section of zones of laser hardening of ductile iron: a – defocused beam, b – oscillating beam

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4. Fig. 3. Graphs of microhardness from the depth of the layer for ductile iron DG60-3: a – defocused beam, b -oscillating beam

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5. Fig. 4. Microstructure of the melting zone of ductile iron DG60-3 ×500

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6. Fig. 5. The dependence of the sliding friction coefficients on the speed in the friction pair GI20-steel 40X: 1 – GI20 (180–210 NV), 2 – LH, 25 J / mm2, 3 –LH, 32 J / mm2, 4 – LH, 46 J / mm2

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7. Fig. 6. Wear intensity of friction pairs GI20-steel 40X: 1 – GI20 (180–210HV), 2 – LH, 25 J / mm2, 3 – LH, 32 J / mm2, 4 – LH, 46 J / mm2

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Copyright (c) 2023 Biryukov V.P.

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